嵌套RecyclerView左右滑动替代自定义view

以前的左右滑动效果采用自定义scrollview或者linearlayout来实现，recyclerview可以很好的做这个功能，一般的需求就是要么一个独立的左右滑动效果，要么在一个列表里的中间部分一个左右滑动效果

而列表里面也容易，只是需要解决一点小问题，个人认为值得一提的就是高度问题，一般的人采用固定死的高度，可是在列表里面展示和机型的不同，固定死的话很难保证美观，动态的高度才能解决问题的所在

首先在一个列表控件布局上添加一个recyclerview控件

<android.support.v7.widget.RecyclerView

        android:id="@+id/plan_recycler"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"/>

然后是adapter适配器布局

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical" android:layout_width="wrap_content"

    android:layout_height="match_parent"

    android:padding="@dimen/dimen_20dp">

    <ImageView android:id="@+id/img_icon"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:src="@drawable/bbs_plan_mofa"/>

    <TextView android:id="@+id/tv_content"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:layout_marginTop="@dimen/dimen_8dp"

        android:textSize="15sp"

        android:textColor="@color/color_323232"/>

</LinearLayout>

接下来写adapter

import android.content.Context;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import com.xulu.loanmanager.R;

import java.util.List;

import butterknife.BindView;

import butterknife.ButterKnife;

/**

 * Created by LiuZhen on 2017/6/22.

 */

public class BBSPlanAdapter extends RecyclerView.Adapter<BBSPlanAdapter.MyViewHolder> {

    private List<String> list;

    private LayoutInflater mInflater;

    private Context context=null;

    private int height;

    private boolean isMeasure = false;

    private CallBack callBack;

    public BBSPlanAdapter(Context context, List<String> list, CallBack callBack) {

        this.context=context;

        this.list = list;

        mInflater = LayoutInflater.from(context);

        this.callBack = callBack;

    }

    @Override

    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = mInflater.inflate(R.layout.item_bbsdetail_plan, parent, false);

        if (!isMeasure) {

            view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);

            height = view.getMeasuredHeight();

            callBack.getHeight(height);

        }

        MyViewHolder holder = new MyViewHolder(view);

        return holder;

    }

    public int getHeight(){

        return height;

    }

    @Override

    public void onBindViewHolder(MyViewHolder holder, final int position) {

        holder.itemView.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                callBack.ItemClick(position);

            }

        });

    }

    @Override

    public int getItemCount() {

        return 6;

    }

    static class MyViewHolder extends RecyclerView.ViewHolder{

        @BindView(R.id.tv_content)

        TextView tv_content;

        MyViewHolder(View view){

            super(view);

            ButterKnife.bind(this,view);

        }

    }

    public interface CallBack{

        void getHeight(int height);

        void ItemClick(int position);

    }

}

重点是measure方法，得到测量的高度

接下来就可以直接使用了

private void initScrollList(){

        final RecyclerView planRecycler = (RecyclerView) headView.findViewById(R.id.plan_recycler);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(BBSDetailActivity.this);

        linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);

        planRecycler.setLayoutManager(linearLayoutManager);

        List<String> list = new ArrayList<>();

        BBSPlanAdapter adapter = new BBSPlanAdapter(BBSDetailActivity.this, list, new BBSPlanAdapter.CallBack() {

            @Override

            public void getHeight(int height) {

                ViewGroup.LayoutParams params = planRecycler.getLayoutParams();

                params.height = height;

                planRecycler.setLayoutParams(params);

            }

            @Override

            public void ItemClick(int position) {

                Toast.makeText(BBSDetailActivity.this,""+position,Toast.LENGTH_SHORT).show();

            }

        });

        planRecycler.setAdapter(adapter);

    }

很简单，完全替代自定义view，效果如下，如果没有测量这一步可能会出现高度不适合，要么是看不到textview的文字，因为太低了，要么就是太高了，不美观